Fig. 7
Effects of exogenous ALA on the H2O2 concentration (a), O2− production rate (b), POD (c) and GPX (d) activities in chloroplasts in leaves of wheat seedlings exposed to drought stress. CK, treated with 0 mg L− 1 ALA + distilled water; ALA, treated with 100 mg L− 1 ALA and distilled water; drought, treated with 0 mg L− 1 ALA without distilled water; D + A, treated with 100 mg L− 1 ALA without distilled water. Error bars represent SD values (n = 3). Different letters indicate significant differences among the treatments (P < 0.01)